semester 1, 2018-2019 kristal-mineral - itny · 2020. 2. 28. · kristal-mineral tgs7113 - 2 sks...
TRANSCRIPT
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Kristal-MineralTGS7113 - 2 SKS teori
by:
Dr. hil. gendoet hartono
Semester 1, 2018-2019
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MINERALOGIIDENTIFIKASI MINERAL
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MINERALOGIIDENTIFIKASI MINERAL
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Special Properties:
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PHYSICAL MINERALOGY
• PROPERTIES DEPENDING UPON LIGHT
• HABIT (OF CRYSTAL FORM)
• HARDNESS AND TENACITY
• CLEAVAGE, PARTING AND FRACTURE
• DENSITY
• MAGNETIC AND ELECTRICAL PROPERTIES
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SIFAT FISIK MINERAL
• SIFAT MINERAL TERHADAP SINAR
• PERAWAKAN (BENTUK KRISTAL)
• KEKERASAN DAN KELENTURAN
• BELAHAN, PARTING DAN REKAH
• DENSITAS
• SIFAT MAGNET DAN HANTARAN-LISTRIK
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SIFAT FISIK MINERAL
1. SIFAT MINERAL TERHADAP SINAR
2. HABIT (OF CRYSTAL FORM)
3. HARDNESS AND TENACITY
4. CLEAVAGE, PARTING AND FRACTURE
5. DENSITY
6. MAGNETIC AND ELECTRICAL PROPERTIES
• SIFAT / KARAKTER SINAR
• REFLEKSI DAN DIFRAKSI
• DISPERSI DAN ABSORPSI
• WARNA
• FLUORESENS
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TRANSPARAN
sinar/cahaya dapat melalui/menembus kristal.
Transparansi berkisar dari yang sejernih air (misalnya
pada kuarsa) sampai yang opak total (sama sekali tidak
tembus sinar/cahaya) seperti pada mineral logam/bijih
misalnya pada magnetit
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WARNA MINERAL
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WARNA DISEBABKAN ADANYA
ABSORPSI ATAU REFRAKSI SINAR
PADA PANJANG GELOMBANG
TERTENTU
HAL LAIN YG MENGHASILKAN WARNA :
KEHADIRAN SEJUMLAH ATOM “ASING”
YANG BUKAN BAGIAN PENYUSUN
MINERAL DALAM STRUKTUR
KRISTALNYA (UNSUR JARANG)
KETIDAKHADIRAN ATOM ATAU ION
RADIKAL DARI POSISI YANG
SEHARUSNYA VACANCY
PLEOCHROISM : GELOMBANG SINAR
BERGETAR PADA BIDANG KRISTAL
TERTENTU AKAN MEMBERIKAN
WARNA BERBEDA BILA DILIHAT DARI
ARAH SUMBU KRISTAL YANG BERBEDA
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Microstructure (parallel
lamellae) in labradorite that act
as a diffraction grating for white
light, producing spectral colours
known as labradoresence
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Colour
• Results from chemical composition and impurities
• Although it is an obvious characteristics it is not very helpful as a mineral identifier due to large variations that can occur
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Flourite has a very large
spectrum of colours
Sulfur is one mineral that has
a diagnostic colour
Yellow
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Colour depends on:
1. Presence of certain atoms - iron or
chromium
– Absorb portions of the light spectrum
• ex. Olivine, (Mg, Fe)2SiO4, Magnesium
Iron Silicate
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2. Presence of impurities
– Sapphire or corundum gets its blue
colour from iron and titanium
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3. Presence of imperfections in the
crystal formations
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KILAP MRP KENAMPAKAN UMUM
PERMUKAAN MINERAL PADA SINAR
PANTUL
KILAP LOGAM DAN NON-LOGAM
MINERAL BERKILAP LOGAM (EMAS,
TEMBAGA, DLL) = OPAK (BAHKAN DI
SAYATAN TIPIS)
MINERAL BERKILAP NON-LOGAM
BERWARNA LBH TERANG, TEMBUS
CAHAYA (PADA SAYATAN TIPIS)
JENIS KILAP NON-LOGAM a.l. :
KILAP KACA, ADAMANTIN/INTAN,
MUTIARA, DAMAR, SUTERA, LEMAK,
TANAH, DLL
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Limonite
showing
yellowish-brown
streak
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http://hays.outcrop.org/images/minerals/press4e/figure-03-20.jpg
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Microstructure (parallel
lamellae) in labradorite that act
as a diffraction grating for white
light, producing spectral colours
known as labradoresence
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Identifikasi mineral juga dilakukan dengan bantuan Mikroskop Polarisasi pada
sayatan tipis batuan (tebal 0,3 mm). Terlihat mineral berlainan mempunyai
perawakan dan warna polarisasi yang berbeda
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PYROXENE (AUGITE) among
plagioclase in anorthosite
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AMPHIBOLE /
HORNBLEND
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BIOTITE surrounded by feldspar and quartz
in granite
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See u next week….